In an effort to control unwanted e-mail, some are turning to Challenge/Response, an email filtering system that checks incoming mail against a white list of approved addresses (such as your personal address book.) If the sender is not on the list, he is sent a challenge email with instructions on how to proceed. If the sender responds correctly, it is assumed he is neither a virus nor computer, and the message is passed to the intended recipient. For more information, see Mailblocks and “EarthLink to Offer Anti-Spam E-Mail System“.

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Feldman, Barbara. "Challenge/Response." Surfnetkids. Feldman Publishing. 15 Sep. 2003. Web. 24 May. 2015. < >.

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By . Originally published September 15, 2003. Last modified September 15, 2003.